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Manual Chapter: Deploying the WAN Optimization Module
Manual Chapter
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WAN Optimization Modules work in pairs on opposite sides of the WAN to optimize the traffic that flows between them. One module runs on a local BIG-IP® system and the other runs on a remote BIG-IP system. A typical configuration includes two WAN Optimization Modules running on BIG-IP systems in two data centers set up to replicate a database over the WAN.
The way you choose to deploy the WAN Optimization Module on BIG-IP systems depends on your current network topology and requirements.
Figure 2.1 shows a simple data center to data center (DC-DC) deployment.
In an inline deployment, you place BIG-IP systems directly in the path of traffic, or inline, for example, between a WAN router and LAN switch.
Router deployment
The BIG-IP system is nontransparent on the network with separate LAN side and WAN side self IP addresses. Clients for which this WAN Optimization Module optimizes traffic must point to the LAN side IP address as the default gateway. This setup ensures that requests from clients go to the WAN Optimization Module, which optimizes the traffic before reaching the server.
Bridge deployment
The BIG-IP system is transparent on the network, and the systems communicate using a single bridge self IP address. You can set up VLANs for the LAN side, the WAN side, and a VLAN group for the bridge. This deployment requires no changes to the router configuration.
In complex networking environments, you can scale inline deployment from a simple point-to-point configuration to a point-to-multi-point configuration or a mesh configuration.
Point-to-point configuration is a simple one-to-one topology where you place BIG-IP systems at each end of the WAN between their respective WAN routers and LAN switches.
Point-to-multipoint configuration (also called hub and spoke) is more complex and involves three or more BIG-IP systems with WAN Optimization Modules.
Mesh configuration also involves three or more BIG-IP systems with WAN Optimization Modules. In this configuration, you configure all other connected WAN Optimization Modules as remote endpoints.
In certain cases, it is not desirable or even possible to deploy the BIG-IP system inline. For example, in the case of a collapsed backbone where the WAN router and LAN switch are in one physical device, you may not be able to deploy the BIG-IP system inline.
If you would prefer not to deploy the BIG-IP system inline, you can use one-arm deployment. In this deployment, the BIG-IP system has a single (hence the term one-arm) connection to the WAN router (or LAN switch). The WAN router (or switch) redirects all relevant traffic to the BIG-IP system. In this configuration, the WAN router typically uses WCCPv2 to redirect traffic to the BIG-IP system.
Figure 2.2 shows the basic topology and traffic flow for a one-arm deployment.
The WAN Optimization Module on the BIG-IP system processes traffic and sends it back to the WAN router.
You can use Web Cache Communication Protocol version 2 (WCCPv2) to tell the router what kinds of traffic to redirect to the BIG-IP system. To use WCCPv2, enable WCCPv2 on one or more routers connected to the BIG-IP system, and configure the WCCP parameters for the routers on the BIG-IP system. The BIG-IP system receives all the network traffic from each router, and determines which traffic to optimize, and which traffic to apply services to. It sends the rest of the traffic back to the router for proper forwarding.
You can configure WCCP on the BIG-IP system in the Network section of the navigation pane if the WAN Optimization Module is provisioned. For more information about WCCP settings, refer to Chapter 7, Configuring WCCPv2 Redirection.
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